David Edmondson <dme@dme.org> writes:

>> Is it possible to cycle-expand-all subtrees in show-mode, à-la Org?
>
> What do you mean by “subtrees”?

Example:

- Message 1
  - Message 2
    - Message 3
      - Message 4
  - Message 5
    - Message 6
  - Message 7

With the point on message 2, have a `notmuch-show-open-or-close'
function that opens/closes all message beneath Message 2 (included), but
does not touch the expansion of Message 1, 5, 6 or 7.

> M-RET should open all of the messages in the thread, but it doesn't do
> anything about regions that are hidden within messages due to washing.

Somehow I had misded M-RET... :p  Thanks!

>> Related: is it possible to search the entire conversation, even when
>> messages are folded?
>
> No.
>
>> If not, the workaround would be to temporarily expand-all (once the
>> above feature is implemented), and search from there.
>
> You might also be able to do something with isearch-open-invisible
> properties on the overlay used to fold messages.

I found a bunch of variables, none of which is documented:

Functions:
- isearch-open-overlay-temporary
- isearch-open-necessary-overlays
- outline-isearch-open-invisible

Variables:
- outline-isearch-open-invisible-function

-- 
Pierre Neidhardt
https://ambrevar.xyz/